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Posted: 12/13/2013 9:20:33 AM EDT
[#1]
Really only affects full-auto carbines as far as I know.
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Posted: 12/13/2013 9:23:08 AM EDT
[#2]
Go to Google and search this: "site:ar15.com m4 feed ramps" You will find a lot of information.
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Posted: 12/13/2013 9:23:20 AM EDT
[#3]
Shortening the gas tube creates a higher impulse on the bolt carrier, which increased the rate of fire by something like 15-20%.
The increased rate of fire saw higher carrier movement speeds, which had a tendency to misfeed every so often. They made a few cuts to the feed ramps, and it fixed it. It sorta matters in a semi, since you still have the same carrier movement speeds. But it's an issue of one malfunction in like 2,000 rounds or something. |
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Posted: 12/13/2013 9:26:17 AM EDT
[#4]
I thought it had a lot to do with using longer rounds like tracers?
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Posted: 12/13/2013 9:27:49 AM EDT
[#5]
Quote HistoryQuoted:
I thought it had a lot to do with using longer rounds like tracers? No I believe that is where the 1/7 twist rate came from. |
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Posted: 12/13/2013 10:22:45 AM EDT
[#6]
Quote HistoryQuoted:
No I believe that is where the 1/7 twist rate came from. Quote HistoryQuoted:
Quoted:
I thought it had a lot to do with using longer rounds like tracers? No I believe that is where the 1/7 twist rate came from. Maybe I was thinking of frangible ammo too. |
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Posted: 12/13/2013 10:23:39 AM EDT
[#7]
Quote HistoryQuoted:
Shortening the gas tube creates a higher impulse on the bolt carrier, which increased the rate of fire by something like 15-20%. The increased rate of fire saw higher carrier movement speeds, which had a tendency to misfeed every so often. They made a few cuts to the feed ramps, and it fixed it. It sorta matters in a semi, since you still have the same carrier movement speeds. But it's an issue of one malfunction in like 2,000 rounds or something. |
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